package org.apache.maven.project;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;

import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.metadata.Metadata;
import org.eclipse.aether.repository.LocalArtifactRegistration;
import org.eclipse.aether.repository.LocalArtifactRequest;
import org.eclipse.aether.repository.LocalArtifactResult;
import org.eclipse.aether.repository.LocalMetadataRegistration;
import org.eclipse.aether.repository.LocalMetadataRequest;
import org.eclipse.aether.repository.LocalMetadataResult;
import org.eclipse.aether.repository.LocalRepository;
import org.eclipse.aether.repository.LocalRepositoryManager;
import org.eclipse.aether.repository.RemoteRepository;

/**
 * @author Benjamin Bentmann
 */
public class LegacyLocalRepositoryManager implements LocalRepositoryManager {

  private final LocalRepository repository;

  public LegacyLocalRepositoryManager(File basedir) {
    this.repository = new LocalRepository(basedir.getAbsoluteFile(), "legacy");
  }

  public LocalRepository getRepository() {
    return repository;
  }

  public String getPathForLocalArtifact(Artifact artifact) {
    StringBuilder path = new StringBuilder(128);

    path.append(artifact.getGroupId()).append('/');

    path.append(artifact.getExtension()).append('s').append('/');

    path.append(artifact.getArtifactId()).append('-').append(artifact.getVersion());

    if (artifact.getClassifier().length() > 0) {
      path.append('-').append(artifact.getClassifier());
    }

    path.append('.').append(artifact.getExtension());

    return path.toString();
  }

  public String getPathForRemoteArtifact(Artifact artifact, RemoteRepository repository, String context) {
    return getPathForLocalArtifact(artifact);
  }

  public String getPathForLocalMetadata(Metadata metadata) {
    return getPath(metadata, "local");
  }

  public String getPathForRemoteMetadata(Metadata metadata, RemoteRepository repository, String context) {
    return getPath(metadata, getRepositoryKey(repository, context));
  }

  String getRepositoryKey(RemoteRepository repository, String context) {
    return repository.getId();
  }

  private String getPath(Metadata metadata, String repositoryKey) {
    StringBuilder path = new StringBuilder(128);

    if (metadata.getGroupId().length() > 0) {
      path.append(metadata.getGroupId().replace('.', '/')).append('/');

      if (metadata.getArtifactId().length() > 0) {
        path.append(metadata.getArtifactId()).append('/');

        if (metadata.getVersion().length() > 0) {
          path.append(metadata.getVersion()).append('/');
        }
      }
    }

    path.append(insertRepositoryKey(metadata.getType(), repositoryKey));

    return path.toString();
  }

  private String insertRepositoryKey(String filename, String repositoryKey) {
    String result;
    int idx = filename.indexOf('.');
    if (idx < 0) {
      result = filename + '-' + repositoryKey;
    } else {
      result = filename.substring(0, idx) + '-' + repositoryKey + filename.substring(idx);
    }
    return result;
  }

  public LocalArtifactResult find(RepositorySystemSession session, LocalArtifactRequest request) {
    String path = getPathForLocalArtifact(request.getArtifact());
    File file = new File(getRepository().getBasedir(), path);

    LocalArtifactResult result = new LocalArtifactResult(request);
    if (file.isFile()) {
      result.setFile(file);
      result.setAvailable(true);
    }

    return result;
  }

  public void add(RepositorySystemSession session, LocalArtifactRegistration request) {
    // noop
  }

  public LocalMetadataResult find(RepositorySystemSession session, LocalMetadataRequest request) {
    LocalMetadataResult result = new LocalMetadataResult(request);

    String path;

    Metadata metadata = request.getMetadata();
    String context = request.getContext();
    RemoteRepository remote = request.getRepository();

    if (remote != null) {
      path = getPathForRemoteMetadata(metadata, remote, context);
    } else {
      path = getPathForLocalMetadata(metadata);
    }

    File file = new File(getRepository().getBasedir(), path);
    if (file.isFile()) {
      result.setFile(file);
    }

    return result;
  }

  public void add(RepositorySystemSession session, LocalMetadataRegistration request) {
    // noop
  }

  public String toString() {
    return String.valueOf(getRepository());
  }
}
